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<meta name="description" content="最近发现某些注册到asterisk的SIP客户端无法被呼叫，抓包确定是由于asterisk往私有IP发送数据，通过对比发现这些客户端发送的SIP信息Contact字段是私有IP，google了下相关资料并未找到解决方法，于是跟踪了下代码，找出了原因，现梳理如下： 12345678910111213141516171819202122232425262728293031323334353637383">
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          <h1 class="post-title" itemprop="name headline">asterisk中fullcontact私有IP导致被呼叫失败</h1>
        

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        <p>最近发现某些注册到asterisk的SIP客户端无法被呼叫，抓包确定是由于asterisk往私有IP发送数据，通过对比发现这些客户端发送的SIP信息Contact字段是私有IP，google了下相关资料并未找到解决方法，于是跟踪了下代码，找出了原因，现梳理如下：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">enum</span> check_auth_result <span class="title">check_user_full</span><span class="params">(struct sip_pvt *p, struct sip_request *req,</span></span></span><br><span class="line"><span class="function"><span class="params">                          <span class="keyword">int</span> sipmethod, <span class="keyword">const</span> <span class="keyword">char</span> *uri, <span class="keyword">enum</span> xmittype reliable,</span></span></span><br><span class="line"><span class="function"><span class="params">                          struct ast_sockaddr *addr, struct sip_peer **authpeer)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    res = check_peer_ok(p, name, req, sipmethod, addr,</span><br><span class="line">            authpeer, reliable, calleridname, uri2);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">enum</span> check_auth_result <span class="title">check_peer_ok</span><span class="params">(struct sip_pvt *p, <span class="keyword">char</span> *of,</span></span></span><br><span class="line"><span class="function"><span class="params">    struct sip_request *req, <span class="keyword">int</span> sipmethod, struct ast_sockaddr *addr,</span></span></span><br><span class="line"><span class="function"><span class="params">    struct sip_peer **authpeer,</span></span></span><br><span class="line"><span class="function"><span class="params">    <span class="keyword">enum</span> xmittype reliable, <span class="keyword">char</span> *calleridname, <span class="keyword">char</span> *uri2)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (sipmethod == SIP_SUBSCRIBE) &#123;</span><br><span class="line">        peer = sip_find_peer(of, <span class="literal">NULL</span>, TRUE, FINDALLDEVICES, FALSE, <span class="number">0</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="function">struct sip_peer *<span class="title">sip_find_peer</span><span class="params">(<span class="keyword">const</span> <span class="keyword">char</span> *peer, struct ast_sockaddr *addr, <span class="keyword">int</span> realtime, <span class="keyword">int</span> which_objects, <span class="keyword">int</span> devstate_only, <span class="keyword">int</span> transport)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">return</span> sip_find_peer_full(peer, addr, <span class="literal">NULL</span>, realtime, which_objects, devstate_only, transport);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> struct sip_peer *<span class="title">sip_find_peer_full</span><span class="params">(<span class="keyword">const</span> <span class="keyword">char</span> *peer, struct ast_sockaddr *addr, <span class="keyword">char</span> *callbackexten, <span class="keyword">int</span> realtime, <span class="keyword">int</span> which_objects, <span class="keyword">int</span> devstate_only, <span class="keyword">int</span> transport)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    ...</span><br><span class="line">    <span class="keyword">if</span> (!p &amp;&amp; (realtime || devstate_only)) &#123;</span><br><span class="line">        p = realtime_peer(peer, addr, callbackexten, devstate_only, which_objects);</span><br><span class="line">        ...</span><br><span class="line">    &#125;</span><br><span class="line">    ...</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> struct sip_peer *<span class="title">realtime_peer</span><span class="params">(<span class="keyword">const</span> <span class="keyword">char</span> *newpeername, struct ast_sockaddr *addr, <span class="keyword">char</span> *callbackexten, <span class="keyword">int</span> devstate_only, <span class="keyword">int</span> which_objects)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    ...</span><br><span class="line">    <span class="comment">/* Peer found in realtime, now build it in memory */</span></span><br><span class="line">    peer = build_peer(newpeername, var, varregs, TRUE, devstate_only);</span><br><span class="line">    ...</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> struct sip_peer *<span class="title">build_peer</span><span class="params">(<span class="keyword">const</span> <span class="keyword">char</span> *name, struct ast_variable *v, struct ast_variable *alt, <span class="keyword">int</span> realtime, <span class="keyword">int</span> devstate_only)</span> </span>&#123;</span><br><span class="line">    ...</span><br><span class="line">    <span class="keyword">if</span> (ast_str_strlen(fullcontact)) &#123;</span><br><span class="line">        ast_string_field_set(peer, fullcontact, ast_str_buffer(fullcontact));</span><br><span class="line">        peer-&gt;rt_fromcontact = TRUE;</span><br><span class="line">        <span class="keyword">if</span> ((!ast_test_flag(&amp;peer-&gt;flags[<span class="number">2</span>],  SIP_PAGE3_NAT_AUTO_RPORT) &amp;&amp; !ast_test_flag(&amp;peer-&gt;flags[<span class="number">0</span>], SIP_NAT_FORCE_RPORT))</span><br><span class="line">            || ast_sockaddr_isnull(&amp;peer-&gt;addr)) &#123;</span><br><span class="line">            __set_address_from_contact(ast_str_buffer(fullcontact), &amp;peer-&gt;addr, <span class="number">0</span>);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    ...</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
      
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